الفهرس 
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Abstract
This work was carried out in the Research Station of Animal Production Department, Faculty of Agriculture, Minia University. The experimental work started in Jaunary 1989 and continoued till January 1990. This wrok aimed to study some productive and reproductive performance in New Zealand White (NZW) and Californian (Cal) rabbits under different lighting conditions (Natural lighting, 18 L : 6 D and 6 L : 18 D) .
Three experimental periods were performed according to the following
First experimental period
Fourty eight female at 2.0 - 2.5 month of age and 18 male at 2.5-3.0 month of age from New Zealand White and Californian rabbits were used in this period. This experimental period was designed to study the effect of breed and different lighting conditions on some productive performance of growing rabbits (body weight, total body gain, daily gain, daily feed consumpption and feed efficiency) .
Five mothers from each breed/treatment were used to study the effect of the different lighting conditions on the repproductive performance of females (Receptivity to mating, gesttation period, litter size at birth and at weaning, mortality rate (%), milk yield) and pre-weaning performance of the offfspring throughout two parities.
This experimental period was designed by using 12 males(2! breed for each treatment). To study the effects of the different lighting conditions and the successive ejaculation on some physical characteristres of semen (e.g. ejaculate volume. percentage of motile spermatozoa. ejaculate pH. ejacuulate concentration and packed sperm volume (PSV %) of NZW and Cal, rabbits.
1- Productive performance of male ~nd female rabbits as
~ affected by breed and lighting conditions
1- There was no significant difference in initial and final body weight between NZW and Cal. female rabbits.while it was significant between the two breed in the male rabbits. Generaly, final body weight of male and female NZW rabbits ~t 4 - 4.5 month were heavier in body weight than Cal. rabbits.
2- Total body gain. daily gain and feed consumption of NZW rabbits exhibited higher values than Cal, rabbits. The differences in total body gain. daily gain and feed consumption were significant in £emales, while it was not significant in males.
3- There was no significant difference between breeds in feed efficiency for male and female rabbits.
4- It was observed that the final body weight, total body gain and daily body gain for males and females under 18 L:6 D had the lowest values compared with the control and 6 L : 18 D.
5- Increasing daily lighting time (18 L : 6 D) decreased daily feed consumption. However decreasing lighting time in tIle control and 6 L : 18 D improved feed eff ic iency co”~ared with 18 L : 6 D.
11- Reproductive performance of the does as affected by breed ,lighting conditions and parity
(a) Receptivity to mating and gestation period :
1- No significant differences were observed for recepptivity to mating or for gestalion period due to breed effect.
2- Lighting conditions had no significant effect on receptivity to mating and gestation period.
3- There was a significant difference in receptivity to mating between the first and second parities and it had lligher value in tIle second pari ty than in the first one. While parities had insignificant effect on gestation period.
(b) Litter size at birth and at weaning
1- The mean values for litter size at birth and at weaning were 7.50±O.42, 5.33±O.26 and 7.33±O.36,